Optimal Dynamical Gauge in the Quantum Rabi Model  

作　　者：Yuqi Qing Liangsheng Li Wen-Long You Yueheng Lan Maoxin Liu 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China [2]Science and Technology on Electromagnetic Scattering Laboratory,Beijing 100854,China [3]College of Science,Nanjing University of Aeronautics and Astronautics,Nanjing,211106,China [4]School of Systems Science/Institute of Nonequilibrium Systems,Beijing Normal University,Beijing 100875,China

出　　处：《Chinese Physics Letters》2025年第2期13-25,共13页中国物理快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12174194 and 12475033);the Fundamental Research Funds for the Central Universities。

摘　　要：We have investigated the gauge dependence of physical observables in a quantum Rabi model under different potential fields arising from the Hilbert space truncation of the atomic degrees of freedom.In both the square-well and harmonic potentials,the optimal gauge for the ground-state energy depends on the cavity frequency,which is optimal in the low-frequency limit,whereas the Coulomb gauge is optimal in the high-frequency limit.For a dynamic quantity,such as an out-of-time-order correlator,we have demonstrated the necessity of introducing an optimal dynamic gauge.This study provides deeper insight into the intricate relationship between gauge choice and the dynamics of quantum electrodynamics systems,resulting in more accurate theoretical frameworks.

关 键 词：GAUGE OPTIMAL QUANTUM 

分 类 号：O413.2[理学—理论物理]